Bearing for spinning machine rollers



Jan. 14, 1941 w. SCHMIDT BEARING FOR SPINNING MACHINE ROLLERS Filed May 10, 1938 Inventor:

We rn er 5chmidf V60 I lfl-orneys Patented Jan. 14, 1941 UNITED STATES BEARING FOR SPINNING MACHINE ROLLERS Werner Schmidt, Torino, Italy, assignor to a. firm s. a. Cotoniflcio Valle 1iv Susa, Torino, Italy, an Italian company Application May 10, 1938, Serial No. 201,103 In Germany May 11, 19:1

6 Claims.

In the thread drawing means of spinning machines, it is customary to provide upper rollers and lower rollers between which the thread is drawn. The upper -roliers rotate freely on porl tions of a shaftor axle carried by the machine frame, and a weight is supported by other portions of said shaft or axle to press the upper rollers toward the lower rollers. I

My invention relates to new and improved l shafts or axles of the drawing rollers or upper rollers of spinning machines.

Hitherto it was customary to manufacture the axle or shaft of drawing rollers from'solid material, especially from solid metal, such as solid 18 steel, bronze or the like. According to the invention, the respective axles or shafts are partly or completely made of porous iron, such as porous cast iron or porous steel. The porous metal may be manufactured in any appropriate way. Pref- 20 erably, comminuted metal particles are welded together under the action of high frequency electric currents. Porous cast iron or steel may alone be used, or slight additions of other metals may be made.

25 emcients of friction and possess the ability to retain lubricants for long periods of time and to give same of! gradually.

The use of porous metal for bearings has been widely recommended. Up to the present time,

30 however, this material had never been used for shafts or axles of the drawing rollers or upper rollers of spinning machines, .on the one hand probably because no particular advantages appeared to be attainable; on the other hand, be-

35 cause the danger of impairing the'bearing surface by spinning dust adhering to the porous surface, and the danger of breakage were regarded as seri ous drawbacks by those skilled in the art.

Now, it was found by extensive investigation 40 that, on the contrary, the use of porous metal axles for the drawing rollers of spinning machines results in greater uniformity and better quality of the thread drawn by said rollers, whereas adhesion of spinning dust to the porous surface may 45 be prevented by suitably designing the axle. Then too, regardless of the porous naturev of the metal used, it has been found to adequately withstand the rough usage to which it is subjected when embodied in spinning machine roller bearings,though 50 the strains encountered in such application are often very sudden and intense, particularly when the workmen place the hold down weights upon the shafts or axles carrying the upper rollers. I

It is an object of the present invention to manu- 66 facture bearings for upper rollers of drawing Such porous metals have low 00- means for spinning machines, which consist, at least partly, of porous metal. 1

Another object-of the invention is to manufacture axles or shafts of the indicated type which partly consist of solid material and partly of porous metal. In a preferred form of the invention, the portion or portions of the axle carrying the weight consist of solid metal, whereas the portions serving as bearing surfaces for the rollers, consist of porous metal, the porous metal and the solid metal being combined to form an integral member.

Figure 1 of the accompanying drawing illustrates a side elevation showing one form of supporting shaft or axle for the upper rollers ofa spinning machine, which shaft or axle isconstructed in accordance with the present invention Figure 2 is a side elevation showing the same shaft or axle with the rollers applied thereto.

Figure 3 is a detail sectional view through the outer end of one of the porous metal bearing portions of the shaft or axle showing the provision for sealing same against leakage of lubricant.

Figure 4 is a side elevation partly in section showing a different form of construction.

According to the embodiment shown in Figs. 1,

2 and 3, the two ends a ofv the shaft or axle for the pressing rolls 0 consist of porous metal, whereas the central portion' b is constructed from massive relatively non-porous metal. Preferably 0 all of the portions a and b are of ferrous metal and cast iron as well as steel have been found to produce the desired results. The three portions 1 and b are rigidly secured together and it is prefer'able that they be integrally united.- The end portions a constitute bearings for the rollers c and they may of course be impregnated with oil or other lubricant. The ends of these porous bearing portions a are preferably sealed with a special varnish or lacquer a to prevent the oil from leaking-from these bearing portions and to prevent collection of spinning dust thereon. The massive or relatively non-porous nature of the central portion b is of special importance as it prevents the spinning dust from adhering thereto.

The solid or massive center part b may be connected to the porous ends a in any suitable manner such aswelding. As shown in Fig. 4, the central portion may consist of an outer bush b made of solid or massive material with a core a of porous metal, which latter is formed in one piece with the porous ends a. The, massive part, i. e. the bush of the center part may be united with its porous core in one integral piece.

By providing the novel construction shown and I porous metal bearings have once been filled with lubricant, no further lubrication is required for quite a long period of time, usually for about three months. Another shaft or axle may then be sbstituted for that previouslyused and the removed part may be recharged with lubricant for further use. Even though the shafts or axles constructed according to the present invention must, like their predecessors, be roughly handled and subjected to sudden and sever strains, particularly when the weights are being placed upon them, they possess all strength required to withstand. this ,punishment.

- While preferences have been disclosed, variations may, of course, be made within the scope of the invention as claimed. Obviously, the porous metal may have any coefiicient of friction suitable for the intended purposes but it is preferred that the bearing surfaces have a coeflicient of friction not exceeding 0.006 under a load of two kilograms per square centimeter at a speed of 0.5 meter per second.

I claim: 1. A shaft for the upper rollers of a spinning machine comprising a central portion of relatively 40 machine, comprising an elongated porous metal member, and relatively non-porous means surrounding the central portion of said porous metal member, the parts of said porous metal member projecting from said non-porous means constituting bearings for the rollers.

4. An article of manufacture constituting a shaft for the upper rollers of a spinning machine;

tions virtually constituting a one-piece metal shaft, said relatively dense and strong central portion being adapted for engagement with the conventional holddown means, said porous end portions constituting bearings for the usual rollers and containing a lubricant therefor.

5. An article of manufacture constituting a shaft for the upper rollers of a spinning machine, comprising an elongated central shaft portion of relatively dense and strong metal, and two elongated shaft end portions of porous metal integrally joined to the ends of said relatively dense and strong central shaft portion, the three shaft portions constituting a one-piece metal shaft, said relatively denseand strong central portion being adapted for engagement with the conventional hold-down means, said porous end portions constituting bearings for the usual rollers and containing a. lubricant therefor.

6. An article of manufacture constituting a shaft for the upper rollers of a spinning machine, comprising a length of porous metal, and a reinforcing sleeve of relatively dense and strong metal, surrounding the central portion of said length of porous metal, said relatively dense and strong metal sleeve being adapted for engagement with the conventional hold-down means, the portions of said length of porous metal projecting from said sleeve constituting bearings for the usual rollers and containing a lubricant therefor.

WERNER scmm'r. 

